I genuinely get where you're coming from, and not making assumptions is of course a great point. I don't like to assume too much too quickly, or judge every single person rehoming an animal on Craigslist. But, in this case, I would have no issue making my statements to this particular owner's face. I have no tolerance anymore I guess.
And you're right, there wasn't nearly as much education on declawing 18 years ago as there is now, so that should be taken into consideration. I'm only guessing that they had it done themselves, but of course I don't know for sure, and I don't know when it was done. They could've just been woefully misinformed, and not known what they were subjecting their cat to. It's the vet that I'd like to get ahold of.
Again, it's this particular situation that I'm admittedly judgmental about, not necessarily every single person on Craigslist. The large majority of posts in the pets section (and well, everywhere on that site) are incredibly irresponsible and/or ignorant. I'm just fed up with hearing the tragic stories of the horrors of CL, and fed up with selfish people that make decisions solely based on what is good or not good for themselves or their lifestyle. It's one of the many reasons I do not visit that site anymore, unless I'm trying to buy or sell something.